聚酯聚氨酯分子动力学的核磁共振研究(英文)  

DYNAMICS STUDY OF POLYES-TERPOLYURETHANES BY HIGH RESOLUTION NUCLEAR MAGNETIC RESONANCE

作　　者：陆兴军 王源身[2] 邬学文[2] 

机构地区：[1]北京燕山石化公司研究院国家检测中心,北京102549 [2]华东师范大学分析测试中心,上海200062

出　　处：《波谱学杂志》1993年第3期221-231,共11页Chinese Journal of Magnetic Resonance

摘　　要：测量了对聚酯聚氨酯在浓溶液状态下质子自旋-晶格弛豫时间随温度的变化,对其中有代表性的基团进行了详细的研究,根据BPP理论用各向同性模型计算分子局部运动的相关时间,从计算结果来看,聚酯聚氨酯的局部分子运动是符合BPP理论的,硬链段的局部分子运动比软链段的局部分子运动要慢得多,两者相差至少一个数量级以上;质子的自旋-晶格弛豫时间主要是偶极-偶极作用的影响;强烈的氢键有相互作用使得硬链段基因的局部运动相关时间接近;通过形成氢键不同的NH峰的相关时间和活化能的观察可以研究软、硬段间的相互作用。Proton spin-lattice relaxation times are reported for a 30% polyesterpolyurethane zwitterionomer solution. Measurements of spin-lattice relaxation time as a function of temperature are included. The correlation times of molecular reorientation were calculated with the isotropic model according to BPP theory. The proton spin-lattice relaxation time of polyesterpolyurethane is dominated by dipole-dipole interaction. The molecular reorientations are not at the same time scale between the hard and the soft segments. The molecular reorientation of the soft segments is much faster than that of the hard segment. Strong hydrogen bonds in the hard segments make molecular reorientations of the hard segment groups to have close correlation times. The interactions between the hard and the soft segments in polyesterpolyurethane can also be investigated by comparison of the correlation times in temperature range studied and by comparison of apparent activation energies of four NH peaks.

关 键 词：动力学 NMR 聚酯型聚氨酯 

分 类 号：O631.2[理学—高分子化学]